Tire-gage.



1.. A. ROBERTSON.

TIRE GAGE. APPLICATION FILED MAY 22, 19I3- RENEWED JULY 22. I916.

1,21 8, 1 1 9. Patented Mar. 6, 1917. v

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TIRE GAGE. v APPLICATION FILED MAY 22p1913- RENEWED JULY 22,1916- 1,218, 1 1 9. Patented Mar. 6, 1917 2 SHEETS-SHEET 2.

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JOHN A. ROBERTSON, or RICHMOND, v1ReINIA,Assreno or 01\T'E'I-IALF r0WIRT A.

MARTIN, or RICHMOND, VIRGINIA.

TIRE-GAGE.

Specification of Letters Patent.

Patented Mar. 6,1917.

Application filed May 22, 1913, Serial No. 769,264. Renewed July 22,1916. Serial No. 110,803.

To all whom it may concern:

Be it known that I, J OHN A. ROBERTSON, a citizen of the United States,residing at Richmond, in the county of Henrico and State of Virginia,have invented certain new and useful Improvements in Tire-Gages; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to new and useful improvements in tire gages forcar wheels and has for its object to provide a device wherein thecorrect relation between the thickness of the tire and the flange formedon the edge thereof will be at all times insured, and whereby the amountof metal to be removed, as well as the actual depth to which the worntire must be cut to restore the flange to its original shape may bedetermined.

Another object of my invention is to provide a device by means of whichthe flange is adapted to be shaped and trued up.

A still further object of my invention is to provide a device of theabove character which may be used on all types of car wheels for theabove and general inspection puroses.

With the above and other objects in view, I will now proceed to describemy invention in the following specification and accompanying drawings,in which- Fignre 1 is a sectional view of a car wheel tire showing myimproved device applied thereto in position for measuring.

Fig. 2 is a view similar to Fig. 1 with the tire gage in position fortesting the finished flange.

Fig. 3 is a horizontal sectional view on line 33 of Fig. 5.

Fig. 4 is a view similar to Fig. 1 as the device would appear whenapplied to a tire which has been worn.

Fig. 5 is a detail view of the gage with the outer plate removed; and

Fig. 6 is a longitudinal sectional view taken on line 6-6 of Fig. 5.

Referring to the drawings by characters of reference, 1 indicates thetire of a wheel having at one side thereof, the usual flange 2. Thisflange 2 is provided with the usual throat 3 at which point it joins thesurface 4 of the-tire.

A gage 6, comprising the main body portion of the frame 7 having at oneextremity thereof an integral arm 8, extending at right angles thereto,is provided with the side plates 9 and 10, which are adapted to beriveted or otherwise attached to the main frame and conceal the innermechanism of the gage. The inner mechanism, which will be hereinaftermore fully described, is contained within an enlarged recess'll' whichis formed intermediate the arm 8 and the op po-site end ofthe frame 7.This recess is closed at its lateral extremities by means of the plates9 and 10 which are secured to the frame as previously described.Openings 12 and 13 are provided in the frame and adapted to communicatewith the inner recess, the use of which will be hereinafter more fullydescribed. A slot 14 extends longitudinally .of the frame said slotbeing adjacent the end opposite the arm 8 and communicating with theopening 13.

The openings 12 and 13 extend at right angles to each other and areadapted to receive pins 15 and 16, respectively; The end of'the pin 15is curved as shown at 17, to

take the contour .of the throat of the car wheel flange, against whichit is adapted to I an aperture through which a rivet 22 is adapted toextend, this rivet isprovided at its outer extremities with heads 23 and24; which are adapted to form thumb pieces whereby the pins 15 and 16may be released. The pin 16 is provided adjacent its opposite end withthe indicator points 25 which are adapted to slide along the graduatedportions 26 of the plates 9 and 10, and indicate at which point the tireis to be out. A link 27 is pivoted to the end of thepin 16 and ispivotally connected at its opposite end with a bell crank 28 which ispivoted'as shown at 29 to the sides 9 and 10 of the gage. The oppositearm of the bell crank extends at right angles to the arm 28 and ispivoted as shown at 30 to a link 3l, the

32. Adjacent the pivot 32 I preferably provide a notch 33 in which theend of a spring 34 is adapted to seat, the opposite end of the spring 3f being rigidly fixed-in the frame of the gage, as clearly illustratedat 35.

The outer extremity of the arm 8 is extended and provided withgraduations 36 by means of which the width of the tire is adapted to bemeasured, or any other measurement may be made. At the point where thearm 8 joins the main body portion of the gage I preferably provide acurve 37 which. is formed to take the contour of the flange of the carwheel thereby permitting the width of the tire to be measured withoutnecessitating a special tool for this particular work, and the contourof the flange to be tested for wear or inaccuracy.

It will be seen from the foregoing that when my improved gage is appliedto a tire of a locomotive or car, should the said tire be worn, the pin15 will slide outwardly, as clearly illustrated in Fig. 4:, so that thesurface 17 comes in contact with the throat of the flange. Upon thesliding of'the pin 15 outwardly the pin '16 slides downwardly andindicates thepoint at which the tire is to be out to form a perfectflange thereon. When my device is applied, as illustrated in Fig. :2, itwill beclearly seen that the width of the tire may be easily determined,the contour of the flange may be tested, and the defects noted.

lVhen roughing out wheels in a lathe a stopping point for the roughingcut may be obtained, by having the pins 15 and 16 locked in theirinner-most position by the latch 20, the lug 19 of which enters thenotch 18 in the pin 16 and holds the same against movement. The gage isthen placed in position on the tire as shown in Fig. 1.

'VVhile in the foregoing,I have shown and described the prefer "edembodiment of my invention, it is to be understood that I may change thespecific structure and arrangement of parts, without departing from thespirit and scope of the appended claims.

' .lVhat I claim is:

1. In a device of the character described, a hollow main bodyportion, anarm extending at right angles from said body port-ion and forming'a stoptherefor, the body being formed with a recess adjacent the arm, the saidrecess being adapted to receive the flange of a car wheel, slidable pinsmounted within the body portion, one of said pins ex tending parallelwith the arm, the other of said pins extending adjacently to the arm andparallel to the body portion and means operably connecting the pins.

2. A device of the character described comprising a frame, platessecured to the sides of the frame, the frame having a recess near oneend, an arm extending at right angles to the frame, and integral withthe recessed end thereof, pins slidable within the frame, linksconnected to the pins, a bell crank operatively mounted between theplates, the arms of the bell crank connecter to the links, and anindicator carried by one of said pins, there beinggraduations on thesides of the plates'coiiperating 'with the in dicator.

3. In a device of the character described, a frame, an arm extending atright angles thereto and formed integral with. one end thereof, said armforming av stop to limit the movement of the frame, pins extending atright angles to each other, a bell crank pivotally mounted within theframe, and links connecting the arms of the hell crank respectively withthe pins, whereby upon reciprocationof one of the pins the other of thepins will. move propm'tionately to the firstanentioned pin.

4.. In a tire gage, a frame, an arm formed at one end of the frame andintegral there with. the framebeing provided with aflano receivingrecessnear the arm, said frame also being provided with a second recess,plates secured'to the frame to close the second cess, pins slidable insaid second recess in the frame, resilient means to force the pins out-I wardly, a bell crank pivoted in the second recess, links connectingthe arms of the bell crank with the pins, and means to lock the pins intheir innermost position.

5. A tire-gage comprising a hollow frame having a fiangereceiving recesstherein, an arm extendingat right angles to the frame, said frame beingprovided with a groove adjacent to the arm and also having a. groovenear its opposite end, a pin slidable in the first-mentioned groove, abell crank pivoted in the frame, a-netchcd pin slidable in thesecond-mentioned groove, each of the pins being connected to the bellcrank, side plates secured to the arame "and adapted to sup port thebell crank, resilient means to force the pins outward-1y, a latchslidable in the frame, and a lug on. the latch adapted to engage in thenotch in the second-mentioned pin to hold said pins in their innermostposition. V

In testimony whereof I -EbfllX my signature in presence of twowitnesses.

JOHN A. ROBERTSON.

Witnesses ALFRED L. BLAKE, A. REED.

Copies of this patent may'be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

